Tkinter 1 line function as command

Question

I have 5 buttons in my program and all of them need to set a single variable.
I could make an separate function function for all of them but i thought there should be an better way to so.
So I tried the following:

 self.__Button1 = tk.Button(self.parent,text='Start', command=lambda: (start_flag = True)).pack()

But this doesnt work. Is there an way to do this or maybe other easy way to all set there own variable (start_flag is one of them)?

Thanks in regards

Update:

With novel's comment i tried the following: But this doesnt work so i will just make 5 almost the same functions as furas suggested.

    def setarr(self, *args, flag, bool):
    # set flag according to button press
    print(flag)
    flag = bool

Answer 1

The normal way to do this is to create a function that takes a single argument, and sets the variable based on a passed-in parameter. You can use either lambda or functools.partial to create the button command:

import Tkinter as tk

class Example(object):
    def __init__(self):
        self.root = tk.Tk()
        self.variable = None
        self.button1 = tk.Button(self.root, text="One",
                                 command=lambda: self.set_variable(1))
        self.button2 = tk.Button(self.root, text="Two", 
                                 command=lambda: self.set_variable(2))
        self.label = tk.Label(self.root, text="", width=20)

        self.label.pack(side="top", fill="x")
        self.button1.pack(side="top")
        self.button2.pack(side="top")

    def start(self):
        self.root.mainloop()

    def set_variable(self, value):
        self.variable = value
        self.label.configure(text="variable = %s" % self.variable)

example = Example()
example.start()